The natural gas is piped in, pressurized by a standard station compressor, and then pumped directly to CNG vehicles or stored in fixed gas cylinder groups (Wells). Process system of gas filling station: pressure regulating metering device, desulfurization and dehydration device, natural gas compressor, CNG gas storage facility, sequence control device, CNG gas filling facility, on-site safety and explosion protection device of gas filling facility, electrical control device, CNG pipeline and components, etc.